CN108559163A - 一种塑料盆的注塑工艺 - Google Patents
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Abstract
本申请公开了塑料制品加工技术领域的一种塑料盆的注塑工艺,包括以下步骤:步骤一、原料准备:所述原料按重量份数由聚乙烯40~50份、二氧化硅8~10份、稀土偶联剂6~8份、五氯硬脂酸甲酯11~13份和硬脂酸12~16份;步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;步骤三、预处理:将注塑机中的螺筒加热至320~340℃,将注塑机中的热流道加热至280~300℃,将注塑模具的模腔清洗干净后进行抛光处理,然后将定模加热至65~75℃,动模加热至45~55℃;步骤四、注塑;步骤五、保压;步骤六、开模。本发明通过原料和工艺两个方向上的改进,消除了塑料盆砂眼的情况。
Description
技术领域
本发明属于塑料制品加工技术领域,具体涉及一种塑料盆的注塑工艺。
背景技术
塑料盆是专指用来盛放物品的容器,因其形状要比钵大且由塑料制成,故而称为塑料盆,可以用于婴儿洗澡盆,洗衣盆,洗漱盆以及用于盛放各式各样的物件。塑料盆由聚乙烯(PE)、聚丙烯(PP)、聚氯乙烯(PVC)、聚苯乙烯(PS)及尼龙(ABS)等通用塑料通过注塑工艺加工而成,加工设备为注塑机,注塑机包括进料仓、螺筒、热流道、喷嘴和模具,模具包括动模和定模。但现有的注塑工艺加工出来的塑料盆有砂眼的问题存在,砂眼指气体或杂质在制品内部或表面形成的小孔,砂眼现象常出现在塑料盆表面,它的存在不仅会影响塑料盆的外观,且会降低塑料盆的使用性能。
发明内容
本发明意在提供一种塑料盆的注塑工艺,以解决现有的注塑工艺加工出来的塑料盆具有砂眼的问题。
为了解决上述问题,本发明提供如下方案:一种塑料盆的注塑工艺,步骤一、原料准备:所述原料按重量份数由聚乙烯40~50份、二氧化硅8~10份、稀土偶联剂6~8份、五氯硬脂酸甲酯11~13份和硬脂酸12~16份;
步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;
步骤三、预处理:将注塑机中的螺筒加热至320~340℃,将注塑机中的热流道加热至280~300℃,将定模和动模的模腔清洗干净后进行抛光处理,然后将定模加热至65~75℃,动模加热至45~55℃;
步骤四、注塑:将混合后的原料添加至预热后的螺筒中,加热至熔融状态,将熔融状态下的原料通过预处理过的热流道喷射到加热后的模具中;
步骤五、保压:通过均匀注射进行保压;
步骤六、开模:保压完成后冷却5~7s,将开模压力设定为60MPa,趁热打开动模得到塑料盆成品。
本方案的原理及其有益效果:1、本发明的塑料盆的原料由聚乙烯、二氧化硅、稀土偶联剂、纳米银、五氯硬脂酸甲酯和硬脂酸组成,以聚乙烯为主要原料,聚乙烯无臭,无毒,具有优良的耐低温性能,化学稳定性好,能耐大多数酸碱的侵蚀,而且聚乙烯的密度较大,熔融后不一产生气泡;稀土偶联剂是由具有多种功能特性的稀土有机化合物组成,它不仅具有双亲结构,还能和超细无机粉体形成核-壳结构,在塑料制品加工中起到增强、增韧功能作用,在PVC材料和聚烯烃材料工业上有明显的优点和巨大的工业应用价值,在塑料改性中发挥巨大的作用。五氯硬脂酸甲酯作为增塑剂,可增加塑料盆的柔软性和延展性。硬脂酸作为分散剂,防止颗粒状原料凝聚或沉降,使得混料更均匀,防止结块导致的砂眼现象,硬脂酸还有可以作为热稳定剂,防止加工过程中焦化的现象。
2、本发明在注塑前,对使用的模腔进行严格处理,避免因模具内壁附有杂质而产生的砂眼现,对定模和动模进行加热处理,使其更容易与熔融后的混合原料接触,避免温差较大,混合原料急剧固化产生气泡,避免了塑料盆砂眼的产生。
综上所述,本发明通过原料和工艺两个方向上的改进,消除了塑料盆砂眼的情况。
进一步,所述原料还包括纳米银5~9份。纳米银在其使用过程中缓慢释放出Ag+,当微量Ag+到达细胞膜时,因后者带负电荷,依靠库仑引力,使两者牢固吸附,Ag+穿透细胞壁进入细胞内,并与巯基反应,使蛋白质凝固,破坏细胞合成酶的活性,细胞丧失分裂增殖能力而死亡,起到抗菌作用。同时银离子还可以和病菌细胞壁上暴露的肽聚糖反应,形成可逆性的复合物,阻滞病菌细胞的能量转运活动,从而导致病菌死亡。银离子还具有较高的极性催化能力,特别是在载体中处于稳定的活化状态,与水和空气中的氧作用可产生H2Oˉ、H2O+、O2-等活性氧物质。这些活性氧物质可破坏细胞内的各种重要高分子生物膜,这对病菌的继续生长和繁殖极为不利,从而起到抗菌效应。这样使本发明的塑料盆具有抗菌的作用。
进一步,所述步骤五中,注射速度为50~65mm/s,保压压力为65~75MPa,压时间为3~5s。其目的是,增强保压效果,提高塑料盆的质量。
具体实施方式
下面通过具体实施方式进一步详细的说明:
实施例1:一种塑料盆的注塑工艺,包括以下步骤:
步骤一、原料准备:所述原料按重量份数由聚乙烯40份、二氧化硅8份、稀土偶联剂6份、纳米银5份、五氯硬脂酸甲酯11份和硬脂酸12份;
步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;
步骤三、预处理:将注塑机中的螺筒加热至320℃,将注塑机中的热流道加热至280℃,将注塑模具的模腔清洗干净后进行抛光处理,然后将定模加热至65℃,动模加热至45℃;
步骤四、注塑:将混合后的原料添加至预热后的螺筒中,加热至熔融状态,将熔融状态下的原料通过预处理过的热流道喷射到加热后的模具中;
步骤五、保压:通过注射速度为50mm/s的情况下进行保压,保压压力为65MPa,压时间为3s;
步骤六、开模:保压完成后冷却5s,将开模压力设定为60MPa,趁热打开动模得到塑料盆成品。
实施例2:一种塑料盆的注塑工艺,包括以下步骤:
步骤一、原料准备:所述原料按重量份数由聚乙烯45份、二氧化硅9份、稀土偶联剂7份、纳米银7份、五氯硬脂酸甲酯12份和硬脂酸14份;
步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;
步骤三、预处理:将注塑机中的螺筒加热至330℃,将注塑机中的热流道加热至290℃,将注塑模具的模腔清洗干净后进行抛光处理,然后将定模加热至70℃,动模加热至50℃;
步骤四、注塑:将混合后的原料添加至预热后的螺筒中,加热至熔融状态,将熔融状态下的原料通过预处理过的热流道喷射到加热后的模具中;
步骤五、保压:通过注射速度为58mm/s的情况下进行保压,保压压力为70MPa,压时间为4s;
步骤六、开模:保压完成后冷却6s,将开模压力设定为60MPa,趁热打开动模得到塑料盆成品。
实施例3:一种塑料盆的注塑工艺,包括以下步骤:
步骤一、原料准备:所述原料按重量份数由聚乙烯50份、二氧化硅10份、稀土偶联剂8份、纳米银9份、五氯硬脂酸甲酯13份和硬脂酸16份;
步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;
步骤三、预处理:将注塑机中的螺筒加热至340℃,将注塑机中的热流道加热至300℃,将注塑模具的模腔清洗干净后进行抛光处理,然后将定模加热至75℃,动模加热至55℃;
步骤四、注塑:将混合后的原料添加至预热后的螺筒中,加热至熔融状态,将熔融状态下的原料通过预处理过的热流道喷射到加热后的模具中;
步骤五、保压:通过注射速度为65mm/s的情况下进行保压,保压压力为75MPa,压时间为5s;
步骤六、开模:保压完成后冷却7s,将开模压力设定为60MPa,趁热打开动模得到塑料盆成品。
选取实施例1~3加工出来的塑料盆和现有工艺加工出来的塑料盆进行检查,每个工艺抽取1000个塑料盆,数据如下:
组别 | 砂眼个数 |
实施例1 | 3 |
实施例2 | 6 |
实施例3 | 4 |
对比例 | 28 |
通过以上数据可以明显得知,本发明的注塑工艺生产出来的塑料盆的砂眼数远远少于现有的注塑工艺。
Claims (3)
1.一种塑料盆的注塑工艺,其特征在于:包括以下步骤:
步骤一、原料准备:所述原料按重量份数由聚乙烯40~50份、二氧化硅8~10份、稀土偶联剂6~8份、五氯硬脂酸甲酯11~13份和硬脂酸12~16份;
步骤二、混料:按配比将所述原料加入搅拌容器中,搅拌均匀;
步骤三、预处理:将注塑机中的螺筒加热至320~340℃,将注塑机中的热流道加热至280~300℃,将定模和动模的模腔清洗干净后进行抛光处理,然后将定模加热至65~75℃,动模加热至45~55℃;
步骤四、注塑:将混合后的原料添加至预热后的螺筒中,加热至熔融状态,将熔融状态下的原料通过预处理过的热流道喷射到加热后的模具中;
步骤五、保压:通过均匀注射进行保压;
步骤六、开模:保压完成后冷却5~7s,将开模压力设定为60MPa,趁热打开动模得到塑料盆成品。
2.根据权利要求1所述的一种塑料盆的注塑工艺,其特征在于:所述原料还包括纳米银5~9份。
3.根据权利要求2所述的一种塑料盆的注塑工艺,其特征在于:所述步骤五中,注射速度为50~65mm/s,保压压力为65~75MPa,压时间为3~5s。
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